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18 August 2005 Femtosecond near-field optical microscope for nonlinear nanospectroscopy
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An aperture-type near-field optical microscope based on hollow-pyramid cantilevered probes has been developed and optimized for ultrafast nonlinear nanospectroscopy applications. These probes have many advantages for near-field microscopy such as higher throughput, higher thermal damage threshold, and absence of pulse chirping. The input pulse duration (as short as 30 fs from a mode-locked, stretched cavity 26 MHz Ti:Sapphire oscillator) is maintained beyond the aperture. Such short pulses, combined with the high peak powers available at the output of hollow-pyramid probes, allow experiments of nonlinear microscopy and spectroscopy with higher spatial and temporal resolution as compared to similar experiments based on optical fiber tips. Results on second-harmonic generation by gold nanostructures and BBO nonlinear crystals are reported demonstrating a spatial resolution down to 100 nm with 40 fs pulses. Implications for local femtosecond time-resolved pump-probe spectroscopy are anticipated.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Massimiliano Labardi, Margherita Zavelani-Rossi, Dario Polli, Michele Celebrano, Giulio Cerullo, Maria Allegrini, Sandro De Silvestri, and Orazio Svelto "Femtosecond near-field optical microscope for nonlinear nanospectroscopy", Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 592710 (18 August 2005);

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